A common term for excessive masturbation in one sitting, resulting in the penis becoming thickly calloused and shaped like a half used colgate tube. The activity is also used as a motivational/teamwork exercise in some lines of work... i.e. Computer programming and I.T.

-"Hey man, did you go to the seminar yesterday on profuse masturbation?"
-"I couldn't make it in to the office, so I just set up a laptop and used the WiFi in Starbucks."